Local zoning · Los Angeles County

Los Angeles County — Overlay Districts

Q: What can the Mixed Use Overlay Zone allow on a parcel?

The Mixed Use Overlay Zone permits the parcel’s principal permitted use and other uses designated in the parcel’s Site‑Specific Development Guidelines; accessory uses are allowed only when tied to an allowed principal use. Development standards default to the primary land use unless the Site‑Specific Guidelines say otherwise, and a detailed plot plan is typically required ( § 22.46.1740–1770 ).

Q: Will an overlay affect ADU approvals in unincorporated Los Angeles County?

ADUs are governed in County code (see § 22.140.640 ) but overlays can include specific language about ADUs. Section 22.300.020.B.3 confirms that ADUs and junior ADUs in a PASD/CSD are subject to § 22.140.640 , but overlay chapters may contain modifications — so check the overlay text and confirm with the County. Verify with the jurisdiction.

Overlay Districts under the Los Angeles County local zoning and planning code, with the controlling citations.

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Last reviewed: July 3, 2026

Overview

Overlay districts in Los Angeles County are special, parcel- or area-specific zoning rules that sit on top of an underlying zone and modify or replace parts of the base rules for property in the unincorporated areas. Overlays in the County take several legal forms — Specific Plans, Planning Area Standards Districts (PASDs), Community Standards Districts (CSDs), Supplemental Districts, and named overlay zones such as the Mixed Use Overlay Zone, Waterfront Overlay, and the MLK Medical Overlay — each with its own permitted uses, standards, and map boundaries. The County’s hierarchy and how overlays interact with base zones and other special districts are governed in Title 22 (Planning and Zoning) of the Los Angeles County Code; see especially the rules in § 22.300.020 on application and precedence.

This page summarizes the County-specific overlay types and the most decision-relevant standards that appear in the County zoning ordinance and related Specific Plans affecting unincorporated Los Angeles County. It is focused on zoning/land-use overlay rules only; for building code, see the California Building Standards Code.

How overlays work in Los Angeles County (quick legal frame)

Overlays (Specific Plans, PASDs, CSDs, Supplemental Districts, named overlays) may supersede the underlying development standards where they conflict; the County codifies this hierarchy in § 22.300.020.
Certain overlays are site-specific and controlled by parcel-level Site-Specific Development Guidelines (for example in Marina del Rey and Santa Catalina Island Specific Plans) and require plot plans or other submittals beyond the base zone. See § 22.46.1770.B (plot plan requirement for Mixed Use Overlay parcels) and the Marina del Rey Specific Plan organization sections.
Overlays can change permitted uses, maximum height, FAR, density, and special improvement requirements (e.g., promenades in coastal Specific Plans). Examples below show how those changes are applied in actual County overlay districts.

County overlay districts — district-by-district breakdown

Note: each district below applies only to property in the County's unincorporated areas. Always verify the parcel boundary maps for applicability.

Mixed Use Overlay Zone (Title 22, Chapter 22.46 — various parcels)

Purpose: The Mixed Use Overlay Zone is an overlay land use category applied to selected parcels to encourage mixed-use projects and increase development flexibility; it combines a parcel’s primary land use category with additional permitted uses designated in parcel-specific Site-Specific Development Guidelines. Intent is stated in § 22.46.1740.
Typical permitted uses: The overlay allows the parcel’s identified principal permitted use and other uses designated in the Site-Specific Development Guidelines; accessory uses are allowed only when developed with an allowed principal use (see § 22.46.1750 and § 22.46.1760 for uses and uses subject to additional permits).
Key dimensional / submittal standards: Development standards generally follow the underlying primary land use category, unless the Site-Specific Development Guidelines state otherwise. A detailed plot plan showing all improvements is required for Mixed Use Overlay projects (§ 22.46.1770.A–B).
Where it applies: Mixed Use Overlay parcels are mapped within several Specific Plans (Marina del Rey, Santa Catalina Island examples appear in parcel tables). See parcel tables in the Marina del Rey and Santa Catalina Island sections of Chapter 22.46.

Waterfront Overlay / Waterfront Overlay designation (Specific Plans such as Catalina / Marina del Rey)

Purpose: Waterfront designations and overlays appear as parcel-level categories inside Coastal Specific Plans (e.g., Santa Catalina Island Specific Plan and Marina del Rey Specific Plan) to protect public access, view corridors, and waterfront uses. These are implemented through site-specific standards and required public improvements (e.g., 28-foot pedestrian promenade). See marina/coastal Specific Plan provisions (Part 3, Chapter 22.46).
Typical permitted uses: Visitor-serving commercial, marine commercial, boat storage, public facilities, and mapped residential categories vary by parcel; the overlay is a map-driven designation that pairs with Site-Specific Development Guidelines (parcel tables list Waterfront Overlay for parcels in § 22.46.1830–1840 and others).
Key dimensional / special requirements: Height limits differ by parcel (height categories are listed for many parcels; e.g., Height Category 1 = 25 ft, Height Category 2 = 45 ft, some parcels up to 140–225 ft where mixed-use options apply) and required public improvements such as a continuous 28‑ft promenade are imposed in the Marina del Rey / Catalina plan text. See the parcel special development considerations in Chapter 22.46.
Where it applies: Specific mapped parcels in the Marina del Rey Specific Plan and Santa Catalina Island Specific Plan lists (parcel tables).

MLK Medical Overlay (County code chapter within Division 22.412)

Purpose: The MLK Medical Overlay promotes medical, clinic, medical office, and supportive uses proximate to Willowbrook/Rosa Parks Station, and permits more intensive development than base IT (Institutional) zoning where mapped. (See 22.412.050 intent language.)
Typical permitted uses: Medical facilities, clinics, medical office, accessory supportive uses, multi-family residential in the overlay, and senior housing (the overlay modifies the IT zone allowances). See § 22.412.050.B.
Key dimensional standards: Maximum building height for multi-family in the overlay is 75 ft; maximum FAR in the MLK Medical Overlay is 2.5; maximum residential density is 60 dwelling units per acre (these are explicit overlay-level overrides to the IT zone standards in § 22.412.050.C.1–3).
Where it applies: A two‑block area bounded by Wilmington Ave, E. 120th St., Holmes St., and E. 118th St. (map in the overlay chapter). Verify parcel applicability with the County’s overlay map.

Planning Area Standards Districts (PASD) — example: Westside PASD (Chapter 22.322)

Purpose: PASDs implement area-specific development standards to carry out an Area Plan; they can provide both area-wide and zone‑specific standards and are given precedence per the Division 10 rules. See § 22.322.040 (Applicability) and the PASD purpose in § 22.322.020–040.
Typical permitted uses: PASDs do not themselves create new generic uses but modify development standards, built-form, and site requirements for base zones inside the PASD boundary. See § 22.322.060 for area-wide development standards (height exclusions, service area treatment, landscaping requirements, etc.).
Key dimensional / standards examples: PASDs may specify building height exceptions (e.g., excluding elevator shafts from max height), stepbacks, landscape and open space minima, and frontage-specific built-form rules. See § 22.322.060 for Westside PASD area-wide standards.
Where it applies: Mapped PASD boundaries (Westside is one example) — check the PASD map in Chapter 22.322 for parcel coverage.

Santa Monica Mountains Local Implementation Program (LIP) — Coastal overlay (Chapter 22.44)

Purpose: The Santa Monica Mountains LIP is the implementation arm of the Santa Monica Mountains Land Use Plan and acts as an overlay of coastal-specific standards; where it applies its provisions prevail over other Title 22 provisions for the Coastal Zone. See § 22.44.600–620.
Typical permitted uses & standards: The LIP contains habitat protection (SERAs), scenic protections, development standards, and special notice and filing rules for coastal permits. The LIP explicitly prioritizes protection of significant environmental resource areas over other development standards (§ 22.44.620.A).
Where it applies: The Santa Monica Mountains Coastal Zone unincorporated boundary (map and text in Chapter 22.44).

Marina del Rey Specific Plan (Part 3 of Chapter 22.46) — treated like an overlay/special plan

Purpose: The Marina del Rey Specific Plan provides parcel-level allowed uses, site‑specific development guidelines, required public improvements, and special height and open space rules that supersede base zoning where they conflict. See § 22.46.1000–1030 for purpose and relationship to zoning.
Typical permitted uses: Parcel-specific visitor-serving uses, marine commercial uses, parking, public facilities, and mixed‑use where mapped (see parcel tables in the Marina del Rey plan).
Key dimensional / required improvements: Examples include the continuous 28‑ft pedestrian promenade requirement and parcel-specific height categories (many parcels capped at 25 ft, 45 ft, 75 ft, up to exceptions where Mixed Use Overlay applies). See the Marina del Rey parcel special development considerations.
Where it applies: Mapped parcels inside Marina del Rey — consult the Specific Plan parcel tables in Chapter 22.46.

Quick reference table — common overlay standards and code references

Overlay / Overlay Type	What it changes (decision‑relevant)	Typical numeric rule or requirement	Code Reference
Mixed Use Overlay Zone	Allows combined uses, may supersede base zone standards; parcel Site‑Specific Guidelines control permitted uses	Plot plan required; development standards default to primary land use unless superseded by site guidelines	§ 22.46.1740–1770
MLK Medical Overlay	Raises allowable intensity for mapped blocks near transit	Height 75 ft, FAR 2.5, 60 du/acre density (overlay overrides IT where mapped)	§ 22.412.050.C.1–3
Waterfront / Specific Plan overlays	Parcel-by-parcel uses, promenade, view corridor & height categories	Required 28‑ft pedestrian promenade; parcel height categories: 25 ft, 45 ft, 75 ft, up to 140–225 ft in limited mixed-use options	Marina del Rey / Catalina Specific Plan tables § 22.46.1000+
PASD / CSD	Area-wide and zone‑specific built form, landscaping, stepbacks, and exceptions	PASD area‑wide height exceptions and landscaping/open-space minima (e.g., 20% landscaped lot requirement in some zones)	§ 22.322.060, § 22.300.020
Santa Monica Mountains LIP	Adds coastal resource and scenic priorities; LIP prevails within the Coastal Zone	SERA protections prioritized; special notice and coastal permit filing rules	§ 22.44.600–620

Practical guidance for applicants (plain-language synthesis)

Always check the parcel‑level overlay map first — many overlay rules are applied parcel-by-parcel in Specific Plans (verify Mixed Use Overlay, Waterfront, and Specific Plan parcel tables). See the parcel tables in the relevant Chapter 22 Specific Plan text.
When an overlay is in place, its standards typically take priority over the base zone where the two conflict; consult § 22.300.020 to understand the regulatory hierarchy and which overlay standard controls.
Expect additional plan-level submittal requirements for overlay parcels: e.g., the Mixed Use Overlay typically requires a detailed plot plan and may require a tentative map or additional site-specific studies (see § 22.46.1770.B).
Coastal or waterfront overlays (Marina del Rey, Santa Catalina Island) commonly require public improvements (promenades, open space), view corridor studies, and special notice/appeal rules; these are site- and parcel-specific in the relevant Specific Plan text (Chapter 22.46 and Chapter 22.44).
Overlays may explicitly modify ADU treatment; the County’s triage rule places ADUs under Section 22.140.640 even within PASDs/CSDs unless the overlay says otherwise — confirm by consulting § 22.300.020.B.3 and the overlay chapter. For state ADU law, see the County ADU references and the California ADU law.

Helpful related County topics: development rules often reference Los Angeles County Zoning and the County Development Standards page; design or permit applications affecting overlays may trigger design review, or change parking needs. For building-safety technical compliance, consult the California Building Standards Code.

Checklist (what an applicant must satisfy for an overlay parcel)

Confirm the parcel lies within the overlay boundary (verify Specific Plan / PASD / CSD maps). Verify with the jurisdiction.
Read the Site‑Specific Development Guidelines or Specific Plan parcel table that lists permitted uses and development standards for that parcel (Mixed Use Overlay parcels always have parcel-specific guidance).
Evaluate conflicts between overlay and base zone standards and apply the hierarchy in § 22.300.020 (overlay may supersede base zone).
Prepare required submittals (detailed plot plan, tentative map if required, shadow/view studies for waterfront parcels, landscape plans where PASD requires landscaping). See Mixed Use Overlay plot plan rule § 22.46.1770.B.
Confirm parking, loading, and access standards (these may be modified by the overlay or Specific Plan). Consult Los Angeles County Parking and the overlay chapter.
If in a coastal overlay / LIP area, determine whether a Coastal Development Permit or additional coastal findings/notices are required under the Specific Plan (Marina del Rey, Santa Monica Mountains LIP).
Confirm whether proposed ADUs are subject to overlay-specific modifications and apply § 22.140.640 if required; if uncertain, Verify with the jurisdiction.

Risks & Ambiguities

Issue	Why it matters	What to verify
Parcel‑specific Site‑Specific Development Guidelines override base rules	Overlays like the Mixed Use Overlay rely on parcel guidelines that can change uses, heights, and required improvements.	Verify the exact parcel guidelines in the Specific Plan tables (e.g., Marina del Rey / Catalina parcel lists) before designing; see § 22.46.1770 and parcel tables in Chapter 22.46.
Conflicts between overlay and underlying zone	The County code sets a hierarchy; an applicant may assume base‑zone rules apply when the overlay actually controls.	Confirm which standard prevails using § 22.300.020 and the overlay chapter text.
Coastal/Specific Plan public‑improvement obligations	Waterfront and coastal overlays often impose public improvements (e.g., promenades) or replacement requirements which affect project cost and phasing.	Check parcel-level required public improvements in the Specific Plan (Marina del Rey: 28‑ft promenade) in Chapter 22.46.
Density / FAR / Height numeric overrides	Overlays like the MLK Medical Overlay explicitly increase FAR, height, and density; designs that ignore these may be under- or over‑sized.	Use overlay-specific numeric standards (e.g., FAR 2.5, 75 ft, 60 du/ac for MLK Medical Overlay in § 22.412.050.C).
ADU applicability inside overlays	Some overlays include special ADU treatment or rely on County ADU provisions; inconsistent application can cause permit delay.	Check § 22.300.020.B.3 and § 22.140.640 for ADU rules within PASDs/CSDs; verify the overlay chapter for contra‑provisions.
Map accuracy and recent ordinance amendments	Ordinance text can change and Specific Plan maps may be updated — relying on an old map risks misapplication.	Confirm current Title 22 map layers and recent ordinances with County Department of Regional Planning. Verify with the jurisdiction.

Plain-English Summary

If your property is in an overlay in unincorporated Los Angeles County, the overlay’s rules (found in a Specific Plan, PASD/CSD chapter, or named overlay) often change what you can build and the design requirements — sometimes allowing more intense development (higher FAR/height) or imposing special public‑improvement and coastal protections. Always check the parcel‑level overlay map and the overlay chapter of Title 22 first, because overlay rules commonly override the regular zoning rules for that parcel.

Source References

Los Angeles County Code, Title 22 — Division 10, Planning Area and Community Standards Districts; Application/Hieararchy rules: § 22.300.020.
Mixed Use Overlay Zone: § 22.46.1740–1770 (Intent; Permitted Uses; Development Standards; plot plan requirement).
Marina del Rey Specific Plan (Part 3, Chapter 22.46): Purpose, parcel tables, public-improvement requirements (28‑ft promenade), parcel height categories — e.g., § 22.46.1000+ and parcel special considerations.
Santa Monica Mountains Local Implementation Program (LIP), coastal overlay rules and priorities: § 22.44.600–620.
MLK Medical Overlay (overlay numeric standards): § 22.412.050 (uses; 75 ft height; FAR 2.5; 60 du/ac).
Westside PASD example (Planning Area Standards District rules and area-wide standards): Chapter 22.322 (Westside PASD; § 22.322.060 for area-wide standards).

If you need official online copies or the current overlay maps, verify with the Los Angeles County Department of Regional Planning (verify with the jurisdiction).

Sources

Retrieved passages

Los Angeles County Zoning Code (§ 1) Medium relevance
Los Angeles County Zoning Code (§ 1) Medium relevance
Los Angeles County Zoning Code (Section 22.44.1400.) Medium relevance
Los Angeles County Zoning Code (§ 22) Medium relevance
Los Angeles County Zoning Code (§ 1) Medium relevance
Los Angeles County Zoning Code (§ 1) Medium relevance
Los Angeles County Zoning Code (Chapter 22.114) Medium relevance
Los Angeles County Zoning Code (Section 22.418.090-E) Medium relevance

Cited sections

Official Los Angeles County code library

Frequently asked questions

What is an overlay district in unincorporated Los Angeles County?

An overlay district is an additional set of zoning rules mapped to particular parcels or areas in the County’s unincorporated territory; it can be a Specific Plan, a Planning Area Standards District (PASD), a Community Standards District (CSD), or a named overlay such as the Mixed Use Overlay Zone. Overlays may replace or modify the base zone rules where they conflict, per § 22.300.020.

What can the Mixed Use Overlay Zone allow on a parcel?

The Mixed Use Overlay Zone permits the parcel’s principal permitted use and other uses designated in the parcel’s Site‑Specific Development Guidelines; accessory uses are allowed only when tied to an allowed principal use. Development standards default to the primary land use unless the Site‑Specific Guidelines say otherwise, and a detailed plot plan is typically required (§ 22.46.1740–1770).

Do overlay districts change height or FAR limits?

Yes — overlays can both increase and decrease allowable height and FAR. For example, the MLK Medical Overlay specifically sets a maximum building height of 75 ft, a maximum FAR of 2.5, and a maximum residential density of 60 du/acre in the overlay area (§ 22.412.050.C). Always use the overlay’s numeric standard rather than assuming the base zone applies.

If my lot is in a Specific Plan overlay, do I still follow the base zone rules?

You must consult both. Specific Plans and other overlays often state that their rules supersede contrary provisions of Title 22. The County’s hierarchy rule in § 22.300.020 explains how overlay provisions control where there is a conflict. Verify parcel-specific guidelines because Specific Plans frequently include parcel tables that replace base zone rules.

Will an overlay affect ADU approvals in unincorporated Los Angeles County?

ADUs are governed in County code (see § 22.140.640) but overlays can include specific language about ADUs. Section 22.300.020.B.3 confirms that ADUs and junior ADUs in a PASD/CSD are subject to § 22.140.640, but overlay chapters may contain modifications — so check the overlay text and confirm with the County. Verify with the jurisdiction.

What extra submittals do overlays commonly require?

Many overlays require parcel- or plan-level submittals beyond a standard application: detailed plot plans, tentative maps (if subdivisions are proposed), shadow/view studies (for waterfront/view corridor exceptions), landscape plans (often in PASDs), and evidence of required public improvements (e.g., promenade construction in Marina del Rey). See § 22.46.1770.B and the Marina del Rey Specific Plan text for examples.

Do coastal overlays make projects appealable to the Coastal Commission?

Specific Plans that implement Local Coastal Programs (LCPs) — such as the Santa Catalina Island Specific Plan and Marina del Rey Local Coastal Program components — include special coastal permit rules and appealability language. The Santa Monica Mountains LIP states LIP provisions prevail in the Coastal Zone and identifies public-access and resource-protection priorities; check the overlay’s coastal permit text for appealability. See § 22.44.600–620 and the Specific Plan coastal permit sections.

Where are overlay boundaries and Site‑Specific Development Guidelines published?

Overlay boundaries and Site‑Specific Development Guidelines are published in the County’s Title 22 chapters (Specific Plans, PASD/CSD chapters, and parcel tables); for parcel‑level details check the applicable chapter (e.g., Chapter 22.46 for Marina del Rey and Santa Catalina Island-specific parcels). If in doubt, verify with the County Department of Regional Planning and the official Title 22 maps.

Can overlays require public improvements that delay or increase project cost?

Yes. Coastal and waterfront overlays commonly require public improvements (Marina del Rey requires a 28‑ft promenade on many parcels). These requirements are in the Specific Plan parcel tables and can affect phasing and project feasibility. Review the parcel special development considerations in Chapter 22.46.

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